Letter. In a Comment published in The Lancet Psychiatry, Scott Lilienfeld and colleagues1 wrote that I encouraged psychotherapists to ignore new practice guidelines for post-traumatic stress disorder (PTSD) because they relied inordinately on randomised controlled trials (RCTs). I did not urge therapists to ignore the guidelines because they relied on RCTs; I urged them to ignore the guidelines because research studies—the same RCTs they laud—show that the recommended therapies do not work for most patients.. Please contact the library to request a copy of this article - http://bit.ly/1Xyazai